221254690081 has 4 divisors (see below), whose sum is σ = 221258037952. Its totient is φ = 221251342212.

The previous prime is 221254690067. The next prime is 221254690099. The reversal of 221254690081 is 180096452122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221254690081 - 2⁵ = 221254690049 is a prime.

It is a super-2 number, since 2×221254690081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221254640081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1572765 + ... + 1707658.

It is an arithmetic number, because the mean of its divisors is an integer number (55314509488).

Almost surely, 2^221254690081 is an apocalyptic number.

It is an amenable number.

221254690081 is a deficient number, since it is larger than the sum of its proper divisors (3347871).

221254690081 is an equidigital number, since it uses as much as digits as its factorization.

221254690081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347870.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 221254690081 in words is "two hundred twenty-one billion, two hundred fifty-four million, six hundred ninety thousand, eighty-one".